package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl implements OrderService {

    //操作订单表
    @Autowired
    private OrderMapper orderMapper;
    //操作订单详情表
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    //操作地址簿表
    @Autowired
    private AddressBookMapper addressBookMapper;
    //操作购物车表
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private UserMapper userMapper;

    private Orders orders;
    @Autowired
    private OrderService orderService;
    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户下单
     *
     * @param ordersSubmitDTO
     * @return
     */
    @Override
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        //先处理各种业务异常（地址簿为空，购物车为空）
        //地址簿为空不能下单
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        //查询购物车是否为空
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.size() == 0) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }
        //向订单表插入一条订单数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);//大部分数据直接复制DTO的
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));//使用当前系统的时间戳作为订单号，转换为String类型
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());//获取收货人
        orders.setUserId(userId);
        orders.setAddress(addressBook.getDetail());
        this.orders = orders;
        orderMapper.insert(orders);
        //批量向订单明细表插入n条数据
        List<OrderDetail> orderDetailList = new ArrayList<>();
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        }
        orderDetailMapper.insertBatch(orderDetailList);
        //清空用户的购物车数据
        shoppingCartMapper.deleteByUserId(userId);
        //封装VO返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();
        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
//        JSONObject jsonObject = weChatPayUtil.pay(
//                ordersPaymentDTO.getOrderNumber(), //商户订单号
//                new BigDecimal(0.01), //支付金额，单位 元
//                "苍穹外卖订单", //商品描述
//                user.getOpenid() //微信用户的openid
//        );
//
//        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
//            throw new OrderBusinessException("该订单已支付");
//        }
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code", "ORDERPAID");
        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));
        Integer OrderPaidStatus = Orders.PAID;//支付状态，已支付
        Integer OrderStatus = Orders.TO_BE_CONFIRMED;  //订单状态，待接单
        LocalDateTime check_out_time = LocalDateTime.now();//更新支付时间
        orderMapper.updateStatus(OrderStatus, OrderPaidStatus, check_out_time, this.orders.getId());

        //通过websocket向客户端浏览器推送消息
        //通过websocket向客户端浏览器推送消息 type orderId content
        Map map = new HashMap();
        map.put("type",1);
        map.put("orderId",this.orders.getId());
        map.put("content","订单号："+this.orders.getNumber());
        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
        return vo;

//        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
//        vo.setPackageStr(jsonObject.getString("package"));
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);
    }

    /**
     * 分页查询
     *
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    @Override
    public PageResult pageQuery(int pageNum, int pageSize, Integer status) {
        //设置分页
        PageHelper.startPage(pageNum, pageSize);
        //分页查询时有单独的DTO对象
        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        //分页查询条件
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();
        //查询出订单明细，并封装入OrderVO返回给前端
        if (page != null && page.getTotal() > 0) {
            for (Orders orders : page) {
                Long orderId = orders.getId();
                //查询订单明细
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);

                OrderVO orderVO = new OrderVO();

                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetails);
                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(), list);
    }

    /**
     * 查询订单详情
     * @param id
     * @return
     */
    @Override
    public OrderVO details(Long id) {
        //根据id查询订单
        Orders orders = orderMapper.getById(id);
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());
        // 将该订单及其详情封装到OrderVO并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO;
    }

    /*
      订单状态 1待支付 2待接单 3已接单 4派送中 5已完成 6已取消
        - 待支付和待接单状态下，用户可直接取消订单
        - 商家已接单状态下，用户取消订单需电话沟通商家
        - 派送中状态下，用户取消订单需电话沟通商家
        - 如果在待接单状态下取消订单，需要给用户退款
        - 取消订单后需要将订单状态修改为“已取消”
     */
    @Override
    public void userCancelById(Long id) throws Exception {
        //先根据订单id查状态
        Orders orders = orderMapper.getById(id);

        if (orders == null) {//检验订单是否存在
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        int status = orders.getStatus();

        if (status > 2) {//这种情况下不能取消了
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        if (status == Orders.TO_BE_CONFIRMED) {//待接单状态下，用户可直接取消订单
            //调用微信支付退款接口
//            weChatPayUtil.refund(
//                    orders.getNumber(), //商户订单号
//                    orders.getNumber(), //商户退款单号
//                    new BigDecimal(0.01),//退款金额，单位 元
//                    new BigDecimal(0.01));//原订单金额
            orders.setPayStatus(Orders.REFUND);//支付状态设置为退款
        }
        //更新待支付状态、待接单状态取消后的信息
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 再来一单（再来一单就是将原订单中的商品重新加入到购物车中）
     *
     * @param id
     */
    @Override
    public void repetition(Long id) {
        Long userId = BaseContext.getCurrentId();
        //已知订单id，先查订单明细表，获取list集合
        //自己写的方法
        /*
        List<OrderDetail> orderDetailslist = orderDetailMapper.getByOrderId(id);
        for (OrderDetail orderDetail : orderDetailslist) {//逐个向购物车插入数据
            ShoppingCart cart = new ShoppingCart();
            cart.setUserId(BaseContext.getCurrentId());
            BeanUtils.copyProperties(orderDetail, cart, "id");
            cart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(cart);
        }
        */
        //使用stream流优化查询速率
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);
        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }


    /**
     * 订单搜索
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);
        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);
        return new PageResult(page.getTotal(), orderVOList);
    }

    /**
     * 各个状态订单的数量查询
     * @return
     */
    @Override
    public OrderStatisticsVO statistics() {
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(orderMapper.getOrderNumByStatus(Orders.TO_BE_CONFIRMED));
        orderStatisticsVO.setConfirmed(orderMapper.getOrderNumByStatus(Orders.CONFIRMED));
        orderStatisticsVO.setDeliveryInProgress(orderMapper.getOrderNumByStatus(Orders.DELIVERY_IN_PROGRESS));
        return orderStatisticsVO;
    }

    /**
     * 商家接单
     * @param ordersConfirmDTO
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    //商家拒单
//    商家拒单其实就是将订单状态修改为“已取消”
//       - 只有订单处于“待接单”状态时可以执行拒单操作
//- 商家拒单时需要指定拒单原因
//- 商家拒单时，如果用户已经完成了支付，需要为用户退款
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) {
        //先判断订单状态是否是待接单
        Orders orders = orderMapper.getById(ordersRejectionDTO.getId());
        if (orders == null||orders.getStatus() != Orders.TO_BE_CONFIRMED) {//订单为空 或 订单状态不对 就不能拒单了
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        //为用户退款
//        int payStatus = orders.getStatus();
//        if (payStatus == Orders.PAID) {
//            String refund = weChatPayUtil.refund(
//                    orders.getNumber(),
//                    orders.getNumber(),
//                    new BigDecimal(0.01),
//                    new BigDecimal(0.01));
//        }

        orders.setStatus(Orders.CANCELLED);//修改订单状态
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());//指定拒单原因
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);

    }

    /*
    取消订单
- 取消订单其实就是将订单状态修改为“已取消”
- 商家取消订单时需要指定取消原因
- 商家取消订单时，如果用户已经完成了支付，需要为用户退款

     */
    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        //先判断订单状态，能取消的是  派送中，已完成，已取消，
        Orders orders = orderMapper.getById(ordersCancelDTO.getId());
        if(orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        if(orders.getStatus() == Orders.CONFIRMED || orders.getStatus() == Orders.DELIVERY_IN_PROGRESS||orders.getStatus() == Orders.COMPLETED){
            //修改订单状态
            orders.setCancelTime(LocalDateTime.now());
            orders.setCancelReason(ordersCancelDTO.getCancelReason());
            orders.setStatus(Orders.CANCELLED);
            orderMapper.update(orders);
            //退款
        }else{
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

    }

    @Override
    public void delivery(Long id) {
        //先判断订单状态，只有带派送（已结单CONFIRMED）可以派送
        Orders orders = orderMapper.getById(id);
        if(orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        if(orders.getStatus() != Orders.CONFIRMED){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);
        orderMapper.update(orders);
    }

    @Override
    public void complete(Long id) {
        Orders orders = orderMapper.getById(id);
        if(orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        if(orders.getStatus() != Orders.DELIVERY_IN_PROGRESS){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    //客户催单
    @Override
    public void reminder(Long id) {
        //先判断订单是否存在
        Orders orders = orderMapper.getById(id);
        if(orders == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        Map map = new HashMap();
        map.put("type", 2);
        map.put("orderId",id);
        map.put("content","订单号："+orders.getNumber());
        //发送消息
        webSocketServer.sendToAllClient(JSON.toJSONString(map));

    }

    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 部分订单状态，需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();
        List<Orders> ordersList = page.getResult();
        if(!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishs = getOrderDishesStr(orders);
                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishs);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }


    /**
     * 根据订单id获取菜品信息字符串
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        //根据orders对象获取订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）

        StringBuilder orderDishesStr = new StringBuilder();
        for (OrderDetail orderDetail : orderDetailList) {
            String str = orderDetail.getName()+"*"+orderDetail.getNumber()+";";
            orderDishesStr.append(str);
        }
        return orderDishesStr.toString();
    }

}
